CN216721618U

CN216721618U - Power distribution system for microwave heating device

Info

Publication number: CN216721618U
Application number: CN202123224626.5U
Authority: CN
Inventors: 连向阳; 何利浩
Original assignee: Jiangsu Boneng Microwave Technology Co ltd
Current assignee: Jiangsu Boneng Microwave Technology Co ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-06-10
Anticipated expiration: 2031-12-21

Abstract

The utility model provides a power distribution system for a microwave heating device, which comprises a distribution assembly, wherein the distribution assembly comprises two E-T distributors, a straight waveguide, a bent waveguide, two H-T distributors, a leaky wave antenna, a heating cavity, a first rectangular guide block and a second rectangular guide block. The multi-mode leaky-wave antenna array mainly based on the TEm0 mode is used for radiating microwave energy to materials to heat the upper and lower surfaces of the heated materials simultaneously, the heating uniformity degree of the materials is greatly improved, meanwhile, the effective radiation surface of the leaky-wave antenna is far larger than that of a common slot antenna, so that the materials are completely covered by the radiation surface, the microwaves can be fully absorbed by the materials and converted into heat energy, the available bandwidth of equipment is greatly widened, the microwaves are distributed in a multi-mode mainly based on the TEm0 mode in a metal cavity, the length of a long and thin slot is far larger than the wavelength of a single microwave, the sensitivity of the equipment to the characteristics of the materials is reduced, the engineering is convenient to implement, the cost is low, and the materials are uniformly heated in the penetration depth direction.

Description

Power distribution system for microwave heating device

Technical Field

The utility model relates to the technical field of microwaves, in particular to a power distribution system for a microwave heating device.

Background

The microwave heating is the result of the interaction between polar molecules in the material and the microwave electromagnetic field, under the action of the external alternating electromagnetic field, the polar molecules in the material are polarized and change along with the change of the polarity of the external alternating electromagnetic field, and a plurality of polar molecules are frequently mutually rubbed and lost, so that the electromagnetic energy is converted into heat energy to heat the material. The microwave heating technology is concerned by people because of the characteristics of instantaneity, high efficiency, no pollution and the like;

the antennas commonly used in the existing microwave heating devices mainly have two categories: one is a slot antenna and the other is a horn antenna. The slot antenna is provided with a number of oblong slots having a length of about 1/2 microwave wavelengths on the outer conductor wall of the transmission line for radiating microwaves outwards. Due to the fact that the radiation area of the slot antenna is limited, interference exists between slot radiation fields, the space fields are distributed unevenly, and materials are heated unevenly; the horn antenna has a small radiation area and is suitable for application with concentrated energy. If the material is heated more uniformly, the number of the horn antennas is increased dramatically, which requires a more complex power distribution and transmission system, increases the complexity and cost of the system, and causes inconvenience in use. Meanwhile, when the microwave radiatively heats the material from a single direction, because the energy of the microwave after entering the material is exponentially attenuated along with the penetration depth, the material is easily heated unevenly in the penetration depth direction, and therefore, the power distribution system for the microwave heating device is provided.

SUMMERY OF THE UTILITY MODEL

Accordingly, embodiments of the present invention are directed to a power distribution system for a microwave heating device, which solves or alleviates the problems of the prior art, and provides at least one advantageous alternative.

The technical scheme of the embodiment of the utility model is realized as follows: a power distribution system for a microwave heating device comprises a distribution assembly, wherein the distribution assembly comprises an E-T two distributor, a straight waveguide, a bent waveguide, an H-T two distributor, a leaky wave antenna, a heating cavity, a first rectangular guide block and a second rectangular guide block;

the microwave oven is characterized in that an E-T two distributor is arranged on the front side of the heating cavity, straight waveguides are arranged on two sides of the heating cavity, a bent waveguide is arranged on one side of each straight waveguide, the bent waveguide is connected with one side of the E-T two distributor, an H-T two distributor is arranged on the other side of each straight waveguide, leaky wave antennas are fixedly connected to the upper surface and the lower surface of the heating cavity, the bent waveguides extend to the top and the bottom of the heating cavity from the positions of the corresponding E-T two distributors in the vertical direction, the straight waveguides are connected with the corresponding H-T distributors, first rectangular guide blocks are fixedly connected to output ports of the H-T two distributors, and second rectangular guide blocks are fixedly connected to the first rectangular guide blocks.

Preferably, one side of the second rectangular guide block is connected with the input port of the corresponding leaky-wave antenna, and the second rectangular guide block plays a role in connection.

Further preferably, the curved waveguide is composed of a transverse rectangular waveguide and a longitudinal rectangular waveguide, the longitudinal rectangular waveguide is vertically installed inside the corresponding transverse rectangular waveguide and is communicated with the transverse rectangular waveguide, and the curved waveguide is arranged to play a role in connection.

Further preferably, the two E-T splitters and the inner wall of the longitudinal rectangular waveguide are provided with cylindrical metal tuners, the inner wall of the transverse rectangular waveguide is provided with a thin plate-shaped tuner, and the thin plate-shaped tuner is convenient to adjust.

Further preferably, the leaky-wave antenna is composed of a horn-shaped tapered waveguide, a rectangular metal cavity and a plurality of elongated slots, and the rectangular metal cavity is arranged, so that the service life is longer.

Preferably, one side of the horn-shaped gradual change waveguide is an input end, the other side of the horn-shaped gradual change waveguide is an output end connected with the rectangular metal cavity, and the horn-shaped gradual change waveguide is convenient to mount.

Further preferably, the length of the elongated slots is perpendicular to one side of the rectangular metal cavity, the distance between the elongated slots is equal, the arrangement of the elongated slots enables the microwaves to be distributed in a multi-mode mainly in a TEm0 mode in the metal cavity, and the length of the elongated slots is far greater than the wavelength of the microwaves.

Further preferably, one side of the first rectangular guide block is fixedly connected with one side of the heating cavity, one side of the second rectangular guide block is fixedly connected with one side of the heating cavity, and the first rectangular guide block plays a role in connection.

Due to the adoption of the technical scheme, the embodiment of the utility model has the following advantages:

the utility model utilizes the multi-mode leaky-wave antenna array which mainly adopts the TEm0 mode to radiate microwave energy to materials at the same time on the upper and lower surfaces of the heated materials for heating, thereby greatly improving the heating uniformity degree of the materials, simultaneously, the effective radiation surface of the leaky-wave antenna is far larger than that of a common slot antenna, so that the materials are completely covered by the radiation surface, the microwaves can be fully absorbed by the materials and converted into heat energy, the available bandwidth of the equipment is greatly widened, the microwaves are distributed in a multi-mode which mainly adopts the TEm0 mode in a metal cavity, the length of a long and thin slot is far larger than the wavelength of a single microwave, the sensitivity of the equipment to the material characteristics is reduced, the engineering implementation is convenient, the cost is low, and the materials are uniformly heated in the penetration depth direction.

The foregoing summary is provided for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the drawings and following detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or technical descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a partial perspective view of the present invention shown in FIG. 1;

FIG. 3 is a perspective view of the connection of the transverse rectangular waveguide, the longitudinal rectangular waveguide and the thin plate tuner of FIG. 1 according to the present invention;

fig. 4 is a three-dimensional structure diagram of the horn-shaped tapered waveguide, the rectangular metal cavity and the elongated slot in fig. 1 according to the present invention.

Reference numerals are as follows: 1. a dispensing assembly; 2. E-T two distributors; 3. a straight waveguide; 4. bending the waveguide; 5. a H-T two distributor; 6. a leaky wave antenna; 7. heating the cavity; 8. a transverse rectangular waveguide; 9. a longitudinal rectangular waveguide; 10. a cylindrical metal tuner; 11. a thin plate-shaped tuner; 12. a horn-shaped tapered waveguide; 13. a rectangular metal cavity; 14. an elongated slot; 15. a first rectangular guide block; 16. a second rectangular guide block.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 4, an embodiment of the present invention provides a power distribution system for a microwave heating apparatus, including a distribution assembly 1, where the distribution assembly 1 includes an E-T distributor 2, a straight waveguide 3, a bent waveguide 4, an H-T two distributor 5, a leaky wave antenna 6, a heating cavity 7, a first rectangular guide block 15, and a second rectangular guide block 16;

the front side of the heating cavity 7 is provided with an E-T distributor 2, two sides of the heating cavity 7 are provided with straight waveguides 3, one side of each straight waveguide 3 is provided with a bent waveguide 4, each bent waveguide 4 is connected with one side of the E-T distributor 2, the other side of each straight waveguide 3 is provided with an H-T distributor 5, the upper surface and the lower surface of the heating cavity 7 are fixedly connected with leaky wave antennas 6, each bent waveguide 4 extends to the top and the bottom of the heating cavity 7 along the vertical direction from the corresponding E-T distributor 2, each straight waveguide 3 is connected with the corresponding H-T distributor 5, an output port of each H-T distributor 5 is fixedly connected with a first rectangular guide block 15, and each first rectangular guide block 15 is fixedly connected with a second rectangular guide block 16.

In one embodiment, one side of the second rectangular guide block 16 is connected to the input port of the corresponding leaky wave antenna 6, and the second rectangular guide block 16 is arranged to function as a connection.

In one embodiment, the curved waveguide 4 is composed of a transverse rectangular waveguide 8 and a longitudinal rectangular waveguide 9, the longitudinal rectangular waveguide 9 is vertically installed inside the corresponding transverse rectangular waveguide 8 and communicated, one side of the curved waveguide 4 is set to be 90 degrees on an E surface, the longitudinal rectangular waveguide 9 serves as an input end, two ports of the transverse rectangular waveguide 8 serve as output ends, and the waveguides work in a TE10 mode.

In one embodiment, the E-T splitter 2 and the longitudinal rectangular waveguide 9 have cylindrical metal tuners 10 mounted on their inner walls, the transverse rectangular waveguide 8 has thin plate-like tuners 11 on its inner wall, the inlet of the longitudinal rectangular waveguide 9 is used as the input end, the two ports of the transverse rectangular waveguide 8 are used as the output end, and the waveguides are operated in TE10 mode.

In one embodiment, the leaky-wave antenna 6 is composed of a horn-shaped tapered waveguide 12, a rectangular metal cavity 13 and a plurality of elongated slots 14, the width of the rectangular metal cavity 13 is within an m λ -m +1 λ interval (m is greater than or equal to 2, λ is a wavelength), microwaves are distributed in the rectangular metal cavity 13 in a multi-mode mainly in a TEm0 mode, and the length of each elongated slot 14 is far greater than 1 microwave wavelength.

In one embodiment, one side of the flared graded waveguide 12 is an input end, the other side of the flared graded waveguide 12 is an output end and is connected with the rectangular metal cavity 13, and two end surfaces in the axial direction of the rectangular metal cavity 13 are of an open structure and are connected with the microwave suppressor.

In one embodiment, the length of the elongated slits 14 is perpendicular to one side of the rectangular metal cavity 13, the distance between the elongated slits 14 is equal, and the material of the conveyor belt can be teflon, polypropylene or metal.

In one embodiment, one side of the first rectangular guide block 15 is fixedly connected with one side of the heating cavity 7, one side of the second rectangular guide block 16 is fixedly connected with one side of the heating cavity 7, and the choke channels of the inlet and the outlet are groove-shaped structures with the depth, the width and the interval of which are formed by bending thin metal plates and are 1/4 wavelengths.

The utility model is in operation: when the microwave heating device is used, the multi-mode leaky-wave antenna 6 array (m is more than or equal to 2) mainly in the TEm0 mode is utilized to radiate microwave energy to materials at the same time on the upper surface and the lower surface of the heated materials for heating, the heating uniformity degree of the materials is greatly improved, meanwhile, the effective radiation surface of the leaky-wave antenna 6 is far larger than that of a common slot antenna, so that the materials are completely covered by the radiation surface, the microwaves can be fully absorbed by the materials and converted into heat energy, the available bandwidth of the device is greatly widened, the width of the rectangular metal cavity 13 is within the range of m lambda to (m + 1) lambda (m is more than or equal to 2, lambda is the wavelength), the microwaves are distributed in the metal cavity in a multi-mode mainly in the TEm0 mode, the length of the long and thin slot 14 is far larger than 1 microwave wavelength, the sensitivity of the device to the material characteristics is reduced, the engineering implementation is convenient, and the cost is low.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various changes or substitutions within the technical scope of the present invention, and these should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A power distribution system for a microwave heating device, comprising a distribution assembly (1), characterized in that: the distribution component (1) comprises two E-T distributors (2), a straight waveguide (3), a bent waveguide (4), two H-T distributors (5), a leaky wave antenna (6), a heating cavity (7), a first rectangular guide block (15) and a second rectangular guide block (16);

the front side of the heating cavity (7) is provided with two E-T distributors (2), two sides of the heating cavity (7) are provided with straight waveguides (3), one side of each straight waveguide (3) is provided with a bent waveguide (4), each bent waveguide (4) is connected with one side of each two E-T distributors (2), the other side of each straight waveguide (3) is provided with two H-T distributors (5), the upper surface and the lower surface of the heating cavity (7) are fixedly connected with leaky wave antennas (6), each bent waveguide (4) extends to the top and the bottom of the heating cavity (7) from the position of the corresponding two E-T distributors (2) along the vertical direction, each straight waveguide (3) is connected with the corresponding two H-T distributors (5), and output ports of the two H-T distributors (5) are fixedly connected with first rectangular guide blocks (15), the first rectangular guide block (15) is fixedly connected with a second rectangular guide block (16).

2. A power distribution system for a microwave heating apparatus as in claim 1, wherein: one side of the second rectangular guide block (16) is connected with the input port of the corresponding leaky-wave antenna (6).

3. A power distribution system for a microwave heating apparatus as in claim 1, wherein: the bent waveguide (4) is composed of a transverse rectangular waveguide (8) and a longitudinal rectangular waveguide (9), and the longitudinal rectangular waveguide (9) is vertically arranged inside the corresponding transverse rectangular waveguide (8) and communicated with the transverse rectangular waveguide.

4. A power distribution system for a microwave heating apparatus as defined in claim 3, wherein: the inner walls of the E-T two distributors (2) and the longitudinal rectangular waveguide (9) are provided with cylindrical metal tuners (10), and the inner wall of the transverse rectangular waveguide (8) is provided with a thin plate-shaped tuner (11).

5. A power distribution system for a microwave heating apparatus as defined in claim 4, wherein: the leaky-wave antenna (6) is composed of a horn-shaped tapered waveguide (12), a rectangular metal cavity (13) and a plurality of elongated slots (14).

6. A power distribution system for a microwave heating apparatus as in claim 5, wherein: one side of the horn-shaped gradual change waveguide (12) is an input end, and the other side of the horn-shaped gradual change waveguide (12) is an output end connected with the rectangular metal cavity (13).

7. A power distribution system for a microwave heating apparatus as defined in claim 6, wherein: the length of the elongated gaps (14) is perpendicular to one side of the rectangular metal cavity (13), and the intervals between the elongated gaps (14) are equal.

8. A power distribution system for a microwave heating apparatus as in claim 1, wherein: one side of the first rectangular guide block (15) is fixedly connected with one side of the heating cavity (7), and one side of the second rectangular guide block (16) is fixedly connected with one side of the heating cavity (7).